/Engine/Source/Editor/UnrealEd/Public/LevelEditorViewport.h
Returns the current global drop preview actor, or a NULL pointer if we don't currently have one
static const [TArray](API\Runtime\Core\Containers\TArray)< [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [AActor](API\Runtime\Engine\GameFramework\AActor) > > & GetDropPreviewActors()